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[HD Street Performance]

All good information and correct
Check these two things
Heat energy of pure gasoline VS alcohol and the native octane rating of both. Tells an important part of the story.
Use what the motor needs, not higher octane, unleaded. This will make the most power assuming there are not excessive amounts of high octane low volitility additives.

[32Lager]

Yeah, I know Chip.  I still remember how gas used to smell back in the good ol' days, and it really did smell good.  If you take a big whiff of the stuff they call gasoline these days it's almost enough to knock you down or make you puke.

Jerry

Back in the 70's, the old gas would make me puke too. All it took was one too many pulls on the hose

[Two Wheels]

wow, learned alot on this one.  Didnt think there was so much to it.   For what its worth, Chevron with Techron 91 Octane seems to be the "normal" best working gasoline for my bike ... for Southern Ca.

[Hoist!]

wow, learned alot on this one.  Didnt think there was so much to it.   For what its worth, Chevron with Techron 91 Octane seems to be the "normal" best working gasoline for my bike ... for Southern Ca.

I try to use only Shell Premium if I can. The bikes run best on that. And that racing fuel chit does smell great, but it didn't pick me up a fraction of a sec at the track. I believe Jerry's right. You don't need any more octane than the engine's designed for. My high compression 80" Evo in my Bobber is the only bike I have that premium isn't good enough on. I use octane booster in that one.

Hoist!

[SBB]

And that racing fuel chit does smell great, but it didn't pick me up a fraction of a sec at the track. I believe Jerry's right. Hoist!

Hoist

1) When were you on the track?

2) Jerry is always right!

3) If for some reason your not sure if Jerry is right, see #2.

SBB

[Hoist!]

Hoist

1) When were you on the track?

2) Jerry is always right!

3) If for some reason your not sure if Jerry is right, see #2.

SBB

HeHe!!! Last time was about 4 years ago. Never had Cybil or Joy there though. They closed the track we used to go to after that summer. Bummer! We tried playing with fuel types too. In the standard low comp engines, type of fuel made no difference at all. In the hi comp bikes it sure did though!

Been trying to organize a Track Day here and across the street. Can't seem to muster any interest from these CVO guys though!

I agree with 2) and 3)!

Hoist!

[Two Wheels]

Hoist ... Shell Vpower has Ethanol in it.

Thought that was no good for the bikes ?   Too much alcoho or something like that. goes bad, etc.....?

[Hoist!]

Hoist ... Shell Vpower has Ethanol in it.

Thought that was no good for the bikes ?   Too much alcoho or something like that. goes bad, etc.....?

In NYC, EVERYTHING has Ethanol in it!

Hoist!

[SBB]

Been trying to organize a Track Day here

Move south, plenty of tracks here!

 

[Fired00d]

Hoist ... Shell Vpower has Ethanol in it.

Thought that was no good for the bikes ?   Too much alcoho or something like that. goes bad, etc.....?

Unfortunately locally I've not been able to find any gas that didn't have that. Plus Shell V-Power has nitrogen in it... and we all know that makes it bettter.

BTW - I do use Shell and/or BP.

 
Ride Safe,
Fired00d
 

[miker]

http://www.racepbir.com/drag/drag-news.html


Come on down in January...

Not gas..


nitro methane

[pokerpig]

The benefit you get from racing fuel is its lack of ethanol - not the octane.
Dont forget what lead does to your plugs!

[SERK3]

I run Shell Prem. in mine as well, BP every once in a while all gas around here has Ethanol in it, ran arcoss a Texaco about a month ago that did not have Ethanol in it and could tell the difference in performance and mileage.

[GtreetSlide]

"If ethanol (stoich AFR of 9) is mixed with gasoline (stoich AFR of 14.7) the resulting gas has a lower stoich AFR than 'pure' gasoline. As the fuel injection is tuned to mix a certain amount of fuel for a given amount of air, the resulting mixture would be leaner when using a fuel with lower stoich AFR.

This can be calculated:

sAFR = (%ofAdditive * sAFRadditive + (90-%ofAdditive) * sAFRgas) /100

where:
sAFR is resulting stoich AFR
%ofAdditive is amount in % of mass of additive (ethanol) mixed in
sAFRadditive is stoich AFR of additive (9 for ethanol)
sAFRgas is stoich AFR of base gasoline (14.7)

For a 10% mixture of ethanol to gasoline by mass the resulting stoich AFR is 14.13

So, for an engine that's tuned to certain AFR at a certain load and RPM on straight gas, the resulting (gasoline equivalent) AFR when running the mixture can be calculated as:

new AFR = tuned gas AFR * (gasoline stoich ratio) / blend stoich ratio

An engine tuned to 12.5 gas AFR will run at the equivalent of 13 gas AFR with a 10% ethanol blend."

jimbob

[GtreetSlide]

"If ethanol (stoich AFR of 9) is mixed with gasoline (stoich AFR of 14.7) the resulting gas has a lower stoich AFR than 'pure' gasoline. As the fuel injection is tuned to mix a certain amount of fuel for a given amount of air, the resulting mixture would be leaner when using a fuel with lower stoich AFR.

This can be calculated:

sAFR = (%ofAdditive * sAFRadditive + (90-%ofAdditive) * sAFRgas) /100

where:
sAFR is resulting stoich AFR
%ofAdditive is amount in % of mass of additive (ethanol) mixed in
sAFRadditive is stoich AFR of additive (9 for ethanol)
sAFRgas is stoich AFR of base gasoline (14.7)

For a 10% mixture of ethanol to gasoline by mass the resulting stoich AFR is 14.13

So, for an engine that's tuned to certain AFR at a certain load and RPM on straight gas, the resulting (gasoline equivalent) AFR when running the mixture can be calculated as:

new AFR = tuned gas AFR * (gasoline stoich ratio) / blend stoich ratio

An engine tuned to 12.5 gas AFR will run at the equivalent of 13 gas AFR with a 10% ethanol blend."

jimbob

One result possible is spark knock when filling with alcohol blended gasoline. It's not so much a fact of too much timing as too lean an AFR setting. I tune for Alcohol for this reason and aim at 14.2 AFR in closed loop.

jimbob